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Approaching to High Elongation of Automotive Steel by Controlled Cooling Strategy
Steel Research International ( IF 1.9 ) Pub Date : 2020-07-21 , DOI: 10.1002/srin.202000276 Yi Xue 1 , Sheng Yin 2 , Qingchao Tian 1 , Xinhua Pei 2
Steel Research International ( IF 1.9 ) Pub Date : 2020-07-21 , DOI: 10.1002/srin.202000276 Yi Xue 1 , Sheng Yin 2 , Qingchao Tian 1 , Xinhua Pei 2
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Automobile steel with moderate tensile strength demands for higher total elongation, whereas present production cannot satisfy such requirement. To cope with the challenge for desired ductility, Ti, Nb, and V microalloyed steel is applied to a late‐stage ultrafast cooling (LUC) method as well as an interrupted ultrafast cooling (IUC) strategy to explore the effect of cooling process on the total elongation. It is found that an IUC can increase the total elongation and the lűders strain to about 45% and 60% higher in comparison with the LUC counterpart, respectively. Metallographic microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and orientation distribution function (ODF) are used to characterize the microstructure and texture components. It is revealed that the multiscale grain distribution and the multiphase constituent, especially the existence of ultrafine pearlite microstructure with several atomic layers of grain boundaries, are greatly important for the ductility enhancement. It is inferred that larger undercooling caused by ultrafast cooling strategy makes the dislocation density much higher, whereas Nb precipitation tends to induce the formation of lamellar pearlite structure.
中文翻译：
通过控制冷却策略实现汽车钢的高延伸率
具有中等拉伸强度的汽车钢要求更高的总伸长率，而目前的生产不能满足这种要求。为应对所需延展性的挑战，将Ti，Nb和V微合金钢应用于后期超快冷却（LUC）方法以及间断超快冷却（IUC）策略，以探索冷却工艺对合金的影响。总伸长率。已发现，与LUC对应物相比，IUC可以将总伸长率和lders应变分别提高到约45％和60％。金相显微镜（OM），扫描电子显微镜（SEM），透射电子显微镜（TEM）和取向分布函数（ODF）用于表征微观结构和织构成分。研究表明，多尺度晶粒分布和多相成分，特别是存在具有几个晶界原子层的超细珠光体显微组织，对于延展性的提高非常重要。可以推测，由于超快冷却策略引起的较大的过冷度，使得位错密度高得多，而Nb的析出趋向于诱导层状珠光体结构的形成。
更新日期：2020-07-21
中文翻译：
通过控制冷却策略实现汽车钢的高延伸率
具有中等拉伸强度的汽车钢要求更高的总伸长率，而目前的生产不能满足这种要求。为应对所需延展性的挑战，将Ti，Nb和V微合金钢应用于后期超快冷却（LUC）方法以及间断超快冷却（IUC）策略，以探索冷却工艺对合金的影响。总伸长率。已发现，与LUC对应物相比，IUC可以将总伸长率和lders应变分别提高到约45％和60％。金相显微镜（OM），扫描电子显微镜（SEM），透射电子显微镜（TEM）和取向分布函数（ODF）用于表征微观结构和织构成分。研究表明，多尺度晶粒分布和多相成分，特别是存在具有几个晶界原子层的超细珠光体显微组织，对于延展性的提高非常重要。可以推测，由于超快冷却策略引起的较大的过冷度，使得位错密度高得多，而Nb的析出趋向于诱导层状珠光体结构的形成。
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